842122111 has 4 divisors (see below), whose sum is σ = 846485632. Its totient is φ = 837758592.

The previous prime is 842122093. The next prime is 842122117. The reversal of 842122111 is 111221248.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 842122111 - 2¹¹ = 842120063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (842122117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2181471 + ... + 2181856.

It is an arithmetic number, because the mean of its divisors is an integer number (211621408).

Almost surely, 2^842122111 is an apocalyptic number.

842122111 is a deficient number, since it is larger than the sum of its proper divisors (4363521).

842122111 is a wasteful number, since it uses less digits than its factorization.

842122111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4363520.

The product of its digits is 256, while the sum is 22.

The square root of 842122111 is about 29019.3402922947. The cubic root of 842122111 is about 944.3326890291.

Adding to 842122111 its reverse (111221248), we get a palindrome (953343359).

The spelling of 842122111 in words is "eight hundred forty-two million, one hundred twenty-two thousand, one hundred eleven".